Observationally, the X-ray pulsars and X-ray bursters can offer
direct measurement of the neutron star mass, but their accuracy is
rather poor and due to large errors, measuring masses of them are
not very useful. Fortunately, the masses of neutron stars have
been determined with high accuracy using the binary radio pulsars
[1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]}, [10]}, [11]}, [12]}, [13]}, [14]}.
